Method and device for improving signal channel utilization rate during retransmission based on error control coding
An error control coding and utilization rate technology, applied in the direction of error prevention, transmission system, digital transmission system, etc., can solve problems such as inability to decode and increase bandwidth utilization rate, and achieve the effect of improving channel utilization rate
Active Publication Date: 2012-07-25
ALCATEL LUCENT SHANGHAI BELL CO LTD
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[0010] For unicast, when retransmitting, as described in method 1, only part or all of the information sequence that has been sent to request retransmission is sent, and the part of the codeword that failed to be decoded during the first transmission cannot be used for decoding, and the bandwidth cannot be improved. Utilization
[0011] For unicast retransmission, as described in method 2, the above-mentioned problem also exists, that is, the newly added generated codeword is simply sent immediately after the retransmitted generated codeword, that is, the newly added generated codeword It is concatenated with the retransmitted generated codewords end to end and then transmitted, and the code length of the concatenated codewords is the superposition of the code lengths of the codewords encoded by the newly added information sequence and the retransmitted information sequence, so the bandwidth cannot be improved. Utilization
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[0027] image 3 It is a block diagram of the existing communication system. Among them, the binary number sequence output by the source coder is called the information sequence, which is transmitted to the channel coder. The purpose of a channel coder is to introduce some redundancy in a controlled manner in a binary information sequence, so that it can be used in a receiving device to overcome the effects of noise and interference to which a signal is transmitted over a channel. Thus, the added redundancy is used to increase the reliability of the received data and to improve the fidelity of the received data. Encoding can take k information bits at a time and map each k-bit sequence into a unique n-bit sequence called a codeword.
[0028] At the receiving device of the communication system, the demodulator processes the channel-degraded transmitted waveform and restores the waveform to a sequence of numbers representing estimates of transmitted data symbols. This sequence...
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If it is judged that transmitting equipment of the invention needs to retransmit an information sequence which is transmitted to receiving equipment, the retransmitted information sequence and a new information sequence are processed by error control coding respectively so as to respectively generate a retransmission generated code word and a new generated code word after the error control coding;the retransmission generated code word and the new generated code word are logically calculated so as to obtain a logically combined code word through the logical calculation; then the logically combined code word is transmitted to the receiving equipment; and the receiving equipment carries out combined decoding according to a long code formed by a code word which is received for the first timeand the logically combined code word so as to obtain the retransmitted information sequence and the new information sequence. By adopting the technical scheme provided by the invention, the transmitting equipment not only retransmits the retransmitted information sequence, but also contains a part of the new information sequence when carrying out the retransmission under the same signal channel bandwidth, so as to improve the utilization rate of a signal channel.
Description
technical field [0001] The present invention relates to a sending device and a receiving device in a communication network, in particular to a sending device and a receiving device based on error control coding of a linear block code. Background technique [0002] Multicast is an important way of providing data. For a multicast system, transmission reliability is a very important parameter. When an error occurs, an error control method of automatic repeat request (ARQ) can be used. [0003] The error control method of ARQ is specifically as follows: the data sequence is group-encoded at the sending device, and some redundant symbols are added to make it have a certain error detection capability, and become a code group that can detect errors. After the receiving device receives the code group, it judges whether there is an error according to certain rules, and sends the judgment result (response signal) back to the sending device through the reverse channel. Acknowledgment...
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IPC IPC(8): H04L1/00H04L1/18
Inventor 沈钢王栋耀吴建明金珊
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD